The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
Preferred waters: Best in freestone streams
In 120 records from GBIF, adults of this genus have mostly been collected during June (38%), July (31%), August (16%), and September (6%).
In 42 records from GBIF, this genus has been collected at elevations ranging from 180 to 5407 ft, with an average (median) of 3018 ft.
Time of day: Dusk
Diet: Mostly plankton; sometimes other aquatic insects
Current speed: Medium to Fast
Substrate: Boulders and gravel
Environmental tolerance: Quite tolerant of pollution and marginal temperature